Study guide · category 6 of 12
Point-of-care testing and lab procedures on the CCMA
Point-of-care testing on the CCMA comes down to a handful of rules about CLIA-waived tests, quality control, specimen handling and urine collection, spread over 9 scored items.
- scored items
- 9
- of the test plan
- 6%
- waived tests in the table
- 8
§01
One rule per item
Small domain, high hit rate once the rules are in place.
The 9 scored items here ask whether you know the rule for the step in front of you: when a result can be reported, how long a tube clots, which part of the urine stream to keep, what ruins a fingerstick. Learn the five rule groups on this page and most items answer themselves.
CLIA-waived tests are simple, low-risk tests a medical office may run under a Certificate of Waiver, as long as it follows the manufacturer's instructions exactly. That covers most of what a CCMA does at the point of care.
| Test | Specimen | What it checks |
|---|---|---|
| Blood glucose | capillary fingerstick | current blood sugar |
| Hemoglobin A1c | capillary blood | longer-term average blood glucose |
| Hemoglobin | capillary blood | anemia screen |
| INR / prothrombin time | capillary blood | warfarin monitoring, clotting time |
| Rapid strep | throat swab | group A strep |
| Urine dipstick | urine | glucose, protein, blood, ketones, pH and more |
| Urine hCG | urine | pregnancy |
| Fecal occult blood | stool on test cards | hidden blood in stool |
When a stem names a waived test, the question is usually about QC or handling.
§02
Quality control before results
The most reliable item in this domain. Learn the order.
Run the controls
Run the high and low controls as the manufacturer and office policy require, for example each day of testing or with a new lot of strips.
Compare with the acceptable range
Each control has a printed range. In range: you may test patients.
Out of range: stop
Don't report patient results. Check expiry dates, storage and technique, rerun the controls, and test patients only after QC passes.
Log it
Record every QC run, including the failures and what you did about them.
§03
Glucose and A1c cut-offs
The middle band is the one people forget.
| Measure | Reading | Falls in |
|---|---|---|
| Hemoglobin A1c | under 5.7% | normal |
| Hemoglobin A1c | 5.7–6.4% | prediabetes |
| Hemoglobin A1c | ≥ 6.5% | diabetes range |
| Fasting glucose | ≥ 126 mg/dL | diabetes range |
| Random glucose | ≥ 200 mg/dL | diabetes range |
A value under the diabetes line isn't automatically normal: an A1c of 6.0% sits in the prediabetes band. A low fingerstick with symptoms (shaky, sweaty) goes to the provider at once.
§04
Collecting a 24-hour urine
Discard the first void. That's the whole trap.
Start, e.g. 7:00
Empty the bladder and discard it
Write down the time. This urine was made before the test began.
Next 24 hours
Keep every void
All urine goes into the container, kept cool as the lab instructs.
End, 7:00 next day
Collect the final void
Void at the same clock time and add it. That completes the collection.
§05
Why time and temperature change results
The specimen keeps living after you collect it.
A tube of blood isn't inert. Until serum is separated, the cells keep using glucose, so a glucose specimen left unspun for hours reads falsely low; that's why glucose goes in a gray-top fluoride tube or is separated promptly. Urine left at room temperature grows bacteria, so a culture specimen that can't reach the lab promptly is refrigerated rather than left on the counter. Light breaks down bilirubin. Each of these is the same idea: protect the specimen from whatever would keep changing it.
Patient preparation counts as well. Fecal occult blood cards come with instructions to avoid red meat and aspirin beforehand because both can produce a false result, and a fasting test is only valid if the patient really fasted. When a stem mentions what the patient did before the test, that detail is usually the point.
§06
Handling the specimen
What you do between collection and the analyzer.
- Clean-catch midstream
Cleanse, start voiding into the toilet, then collect the middle of the stream. Used when the provider orders a culture, because it keeps urethral and skin bacteria out. If it can't reach the lab promptly, refrigerate it.
- Serum tubes
Let a red or gold tube clot fully, about 30 minutes, before centrifuging. Spinning too early leaves fibrin in the serum. Tube colors and draw order live on the phlebotomy page.
- Light-sensitive specimens
Bilirubin is wrapped in foil or an amber container.
- Stool
Occult blood cards come with diet and medication instructions to follow before testing; ova and parasite samples go into their preservative vials promptly.
- Hemolysis
Broken red cells change results. Rough mixing and a small needle are common causes.
§07
Point-of-care and lab questions
QC, glucose, urine, clotting time, specimen care.
Each of these turns on a single handling rule. When you miss one, read which step the wrong option skipped; that step is what the exam is testing.
A newborn's bilirubin specimen has just been collected. How should the MA handle it before transport?
Answer & explanation
Answer: C. Protect it from light with foil
Bilirubin breaks down in light, so the specimen is protected in foil or an amber container to avoid a falsely low result. Chilling in an ice slurry is for specimens such as ammonia and blood gases, and body-temperature transport is for cold agglutinins and cryoglobulins. Sending it unprotected lets light exposure lower the result during transport.
- Bilirubin breaks down in light, so an unprotected tube can give a falsely low result.
- Keeping a tube at body temperature is for specimens like cold agglutinins, not bilirubin.
- Correct: bilirubin is light-sensitive, so wrapping the tube in foil or using an amber tube protects the result.
- Ice is used for specimens like ammonia or blood gases; bilirubin needs protection from light instead.
A clean-catch urine specimen for culture cannot reach the laboratory for 3 hours. What should the MA do with it?
Answer & explanation
Answer: B. Refrigerate it at 2–8°C until transport
Urine for culture should be tested within about 2 hours or refrigerated, because bacteria multiply at room temperature and a delayed specimen can show a falsely high colony count. Leaving it at room temperature is the tempting error, since that rule applies to blood cultures, not urine. Incubating speeds up overgrowth even more, and freezing can kill organisms and give a false-negative culture.
- Body temperature encourages bacteria to multiply, which would make the culture count falsely high.
- Correct: refrigeration slows bacterial growth while keeping organisms alive, so the culture stays accurate until transport.
- Freezing can kill or damage bacteria, preventing an accurate culture result.
- Hours at room temperature let bacteria multiply, which can falsely raise colony counts.
Which would invalidate a point-of-care glucose result?
Answer & explanation
Answer: A. Residual alcohol sanitizer left on the fingertip
Alcohol or sanitizer residue interferes with the strip chemistry and skews the reading, so the site must be dry. Wiping the first drop and lancing the side are correct, and fasting does not invalidate the test.
- Correct: alcohol or sanitizer left on the finger dilutes the sample and reacts with the strip, distorting the reading.
- Fasting is a planned condition for many glucose tests and does not invalidate the result.
- Wiping away the first drop is recommended, since it may contain tissue fluid or alcohol residue.
- Lancing the side of the fingertip is correct technique and hurts less than the pad.
A patient's point-of-care hemoglobin A1c result is 6.1%. Which reference range does this value fall in?
Answer & explanation
Answer: D. Prediabetes (5.7–6.4%)
An A1c below 5.7% is normal, 5.7–6.4% is prediabetes, and 6.5% or higher meets the diabetes cutoff. Calling 6.1% normal because it is under 6.5% ignores the prediabetes band, and 7.0% is a common treatment target for people who already have diabetes, not a normal range. The MA flags the value for the provider, who interprets it.
- Normal A1c is below 5.7%, not below 6.5%; this option stretches normal into the prediabetes band.
- The diabetes threshold is 6.5% or higher, not 6.0%, so 6.1% does not qualify.
- Many people with diabetes aim to keep A1c under 7.0%, but that goal is not the normal range.
- Correct: an A1c from 5.7% to 6.4% is prediabetes, so 6.1% falls squarely in that band.
What is the most important instruction for a clean-catch midstream urine collection?
Answer & explanation
Answer: D. Cleanse the meatus, then collect urine midstream
Cleansing then catching the midstream portion washes away urethral flora, giving a specimen valid for culture. Collecting the first portion instead captures that contaminating flora.
- The cup should not touch the skin, which would add skin bacteria to the specimen.
- The first portion flushes the urethra and goes into the toilet; the midstream portion is collected.
- Extra fluids dilute the urine and are not part of clean-catch instructions.
- Correct: cleansing the urethral meatus and catching the midstream portion keeps skin flora out of the culture.
An MA draws a gold SST for a comprehensive metabolic panel. When may the tube be centrifuged?
Answer & explanation
Answer: C. After it clots upright for about 30 minutes
Serum tubes must clot completely, about 30 minutes upright, before centrifuging; spinning too early leaves fibrin strands and can give an unusable specimen. The gel only forms a barrier after a clot exists, so it does not replace clotting time. Inversion mixes the clot activator but does not complete clotting, and refrigeration slows clotting rather than speeding it.
- The gel separates serum only after clotting and centrifugation; spinning too early leaves fibrin and poor separation.
- Refrigeration is not needed before centrifuging an SST and can affect some chemistry results.
- Correct: a gold SST needs about 30 minutes upright to clot completely before it is centrifuged.
- Five minutes of inversion mixes in the clot activator but does not allow enough clotting time.
A patient is collecting stool at home for ova and parasite testing. Which instruction is correct?
Answer & explanation
Answer: B. Add portions to the preservative vials promptly
Trophozoites and cysts deteriorate quickly, so stool for O&P is placed into the fixative vials (such as formalin) promptly after collection. Refrigeration is appropriate for many specimens, which is why it tempts, but it does not preserve parasite forms the way fixative does. Toilet water contaminates the specimen and can destroy trophozoites, and freezing distorts the organisms.
- Freezing can damage parasites and eggs, so ova and parasite specimens are not frozen.
- Correct: placing stool promptly into the preservative vials keeps parasites and eggs intact for accurate testing.
- Toilet water and urine can destroy parasites and contaminate the stool sample.
- Holding raw stool until the next visit lets parasites degrade even if it is refrigerated.
A patient is sent home with a guaiac fecal occult blood test. Which food should she avoid for 3 days before collecting samples?
Answer & explanation
Answer: C. Red meat
Guaiac tests detect the peroxidase activity of hemoglobin, so hemoglobin in red meat can cause a false-positive result. Chicken and fish are the usual allowed protein substitutes, which is why they are tempting to exclude too. Plain starches and well-cooked vegetables do not affect the result; the restrictions are red meat, certain raw vegetables, vitamin C, and NSAIDs.
- Well-cooked vegetables like green beans do not affect a guaiac result, so they can stay.
- Chicken and fish are the usual allowed protein substitutes during the test preparation.
- Correct: hemoglobin in red meat can react with the guaiac reagent and cause a false positive.
- Plain starches like rice and bread have no effect on the test and can be eaten.
How long must a plain serum (red-top) tube clot before centrifuging?
Answer & explanation
Answer: C. About 30 minutes at room temperature
A serum tube must clot completely, about 30 minutes at room temperature, before centrifugation; spinning too soon leaves fibrin that interferes with results. Clotting is not accelerated by refrigeration.
- Five minutes is not long enough for the blood to form a complete clot.
- Centrifuging right away spins unclotted blood, leaving fibrin strands and poor serum separation.
- Correct: about 30 minutes at room temperature lets a red-top tube clot fully before centrifuging.
- Refrigeration slows clotting and is not part of routine serum tube processing.
For which patient should the MA avoid a fingerstick glucose and ask the provider about a venous sample instead?
Answer & explanation
Answer: B. A patient in shock with cold, mottled hands
Poor peripheral circulation, as in shock or severe dehydration, gives capillary samples that do not reflect true blood glucose, so a venous sample is preferred. A recent meal changes the glucose value, but the fingerstick still measures it correctly. Insulin use is a reason to test, and calluses are handled by choosing another finger.
- A recent meal changes the value, but the fingerstick still measures it accurately.
- Correct: poor circulation means capillary blood does not reflect true glucose, so ask about a venous sample.
- Insulin use is a reason to check glucose, not a reason to avoid a fingerstick.
- Calluses are handled by choosing a different finger; they do not rule out capillary testing.
A venous glucose specimen drawn in a red-top tube sits for 3 hours at room temperature before it is centrifuged. How will the glucose result most likely be affected?
Answer & explanation
Answer: B. Falsely low, because cells keep using glucose
Red and white cells continue glycolysis until serum is separated, lowering glucose by several percent each hour. That is why glucose is drawn in a gray-top (sodium fluoride) tube or separated promptly. A capped tube does not lose water in 3 hours, and red cells do not hold a glucose store that hemolysis would release.
- Hemolysis does not release stored glucose; cells consume glucose, so the value falls instead.
- Correct: cells keep using glucose in an unspun tube, lowering the result roughly 5–7% per hour at room temperature.
- A capped tube does not lose meaningful water in three hours, so evaporation is not the issue.
- Glucose is not stable in whole blood without a preservative, which is why gray-top fluoride tubes exist.
A patient who is shaky and sweaty has a fingerstick glucose of 45 mg/dL. What should the MA do first?
Answer & explanation
Answer: D. Notify the provider right away
A glucose below 70 mg/dL with symptoms is hypoglycemia, and 45 mg/dL is a critical value that needs immediate provider action, often fast-acting carbohydrate per the office protocol. Waiting 30 minutes or sending a venous confirmation delays treatment while the patient could lose consciousness. Simply recording it and suggesting a meal leaves an urgent result unreported.
- Waiting 30 minutes leaves a symptomatic hypoglycemic patient untreated and at risk of losing consciousness.
- A critical value must be reported right away, not just documented with dietary advice.
- A venous confirmation delays care; the symptoms and value already call for immediate provider action.
- Correct: a glucose of 45 mg/dL with shakiness and sweating is a critical result, so the provider hears about it immediately.
Before reporting waived-test results for the day, what must be true?
Answer & explanation
Answer: C. That day's QC has passed acceptably
Patient results are released only after that run's QC is acceptable, confirming the system performs correctly. Provider pre-signature, patient counts, or warm-up time are not the requirement.
- Instrument run time does not confirm accuracy; only acceptable QC results show the system is working.
- Testing patients before QC risks reporting inaccurate results to people who rely on them.
- Correct: patient results are reported only after that day's quality control falls within the acceptable range.
- Pre-signing a result sheet does not verify the test system and is not a QC requirement.
Which federal agency certifies laboratories and enforces CLIA regulations?
Answer & explanation
Answer: A. CMS
The Centers for Medicare & Medicaid Services (CMS) issues CLIA certificates, including the Certificate of Waiver, and enforces the regulations. The FDA is the tempting choice because it decides which tests are categorized as waived, but it does not certify labs. The CDC provides technical guidance, and OSHA protects workers, not test quality.
- Correct: CMS issues CLIA certificates and enforces the regulations, including inspections and fees.
- The FDA categorizes tests by complexity, including waived status, but does not certify laboratories.
- OSHA protects worker safety in the lab, such as bloodborne pathogen rules, not CLIA certification.
- The CDC provides scientific support and guidance for CLIA but does not certify labs or enforce the rules.
How is a pinworm (perianal) specimen correctly collected?
Answer & explanation
Answer: D. Press clear tape to the perianal skin at dawn
Pinworm eggs are picked up by pressing clear tape to the perianal skin in the early morning before bathing or a bowel movement. Stool, swab, or urine collection misses the eggs laid overnight.
- Pinworm eggs are laid on the perianal skin, so routine stool samples often miss them.
- Swabbing inside the anal canal is not the standard method; eggs are collected from the outer perianal skin.
- Urine does not contain pinworm eggs, so a urine specimen cannot detect the infection.
- Correct: clear tape pressed to perianal skin first thing in the morning picks up eggs laid overnight.
That is the whole set. Open any card to re-read its explanation, or start over.
§08
Waived tests, QC and A1c
Four points people double-check.
What is a CLIA-waived test?
A simple test with a low risk of a wrong result, cleared for use outside a full laboratory. An office running one needs a Certificate of Waiver and must follow the manufacturer's instructions exactly.
Can a medical assistant report a result if QC failed?
No. Patient results wait until the controls are back in range.
Do I need to know the chemistry behind each test?
No. The exam asks how to collect, handle, run and report a test. Knowing which tube or container each specimen needs, and why, covers most items.
Is A1c on the CCMA?
Yes, usually as a value to classify: under 5.7% normal, 5.7–6.4% prediabetes, 6.5% or higher in the diabetes range.
§09
Concepts and next categories
1 concept page for this category, then the categories on either side.