Point of care testing (POCT) brings the lab to the patient. Instead of sending a specimen off-site and waiting hours for results, POCT gives clinicians actionable data within minutes. Medical assistants perform most POCT in outpatient settings — and with that comes responsibility for quality control, accurate documentation, and recognizing when results are outside the safe range.
CLIA and the Certificate of Waiver
The Clinical Laboratory Improvement Amendments (CLIA) regulate all laboratory testing on human specimens. Tests are classified by complexity. Waived tests are the simplest and lowest-risk — they use straightforward methodology and have minimal risk of harm if performed incorrectly compared to more complex tests.
Medical assistants perform CLIA-waived tests. A facility must hold a Certificate of Waiver (COW) from CMS to legally perform these tests. This certificate must be renewed every two years and is site-specific — a certificate for one office location does not cover a satellite clinic. Staff must follow the manufacturer's instructions exactly. Deviation from instructions technically removes the test from waived status.
Know this: performing a test outside its approved conditions voids the waiver. If you modify the procedure, you are now performing a moderate complexity test without the appropriate certification.
CLIA-Waived Tests MAs Commonly Perform
Blood Glucose (Glucometer)
Fingerstick blood glucose is one of the most frequently performed POCT in outpatient settings. Used to monitor diabetes management, assess hypoglycemia or hyperglycemia symptoms, and screen for diabetes.
Technique:
- Verify patient identity and last food/drink intake (relevant for fasting vs. random glucose)
- Confirm the glucometer has been QC tested today
- Clean the finger with an alcohol wipe, let dry completely — wet skin dilutes the blood sample
- Lance the lateral side of a fingertip (not the pad — more nerve endings and more painful)
- Wipe away the first drop of blood (may contain tissue fluid that dilutes the sample)
- Apply the second drop to the test strip
- Read and document the result
Normal values: Fasting: 70-99 mg/dL. Two-hour postprandial: less than 140 mg/dL. Random: varies.
Critical values: Below 40 mg/dL (severe hypoglycemia — report immediately). Above 500 mg/dL in many facilities.
Urinalysis Dipstick
A chemical dipstick provides rapid, semi-quantitative analysis of urine. The strip contains reagent pads that change color in response to specific substances.
Parameters tested: pH, specific gravity, protein, glucose, ketones, blood (hemoglobin), bilirubin, urobilinogen, nitrites, leukocyte esterase, color, and clarity.
Technique:
- Use a fresh urine specimen — ideally less than 1 hour old. If stored, let refrigerated specimen reach room temperature first.
- Dip the entire strip in urine briefly (1-2 seconds), remove and run the edge along the rim to remove excess
- Hold the strip horizontal — tilting allows chemical cross-contamination between pads
- Read each pad at the specified time (varies by pad — check the chart on the bottle)
- Compare to the color chart on the bottle in good lighting
Nitrites and leukocyte esterase together are the most sensitive dipstick indicators of UTI. Either alone has moderate sensitivity; together they are stronger evidence. Positive results typically prompt a culture.
Urine Pregnancy Test (hCG)
Detects human chorionic gonadotropin (hCG) in urine. Most sensitive with first-morning urine (most concentrated). Can detect pregnancy as early as 6-8 days after fertilization. A positive result in a patient with abdominal pain or abnormal vaginal bleeding requires immediate provider notification — ectopic pregnancy must be ruled out.
Rapid Strep Test (Rapid Antigen Detection Test)
Detects Group A Streptococcal antigen directly from a throat swab. Results in 5-10 minutes. Specificity is high (~95%) — a positive result is reliable. Sensitivity is 70-90% — a negative result in a high-clinical-suspicion patient should be followed by a throat culture. Follow the specific kit's instructions for swab processing and result reading. Timing matters — read results at the specified time, not earlier or later.
Rapid Influenza Diagnostic Test (RIDT)
Detects influenza A and B antigens from a nasopharyngeal swab. Results in 10-15 minutes. Lower sensitivity than molecular testing — a negative result does not rule out flu during high-prevalence season. Positive results guide antiviral prescribing decisions.
Occult Blood (Fecal)
Point of care version available in some settings using guaiac or immunochemical methods. Patient collects stool at home per instructions, returns the test card. MA develops the test with developer solution per kit instructions. Two separate windows on the card are read — both must be negative for a negative result.
Hemoglobin (HemoCue or similar)
Fingerstick test providing immediate hemoglobin level. Used for anemia screening, pre-procedural assessment, and monitoring. Different from a CBC — provides hemoglobin only, not a full blood count.
Quality Control Requirements
QC is not optional. Running QC confirms that your equipment and reagents are working correctly and that your technique is sound. Before you trust any patient result, QC must pass.
How QC works: Control solutions (at least one low and one high level) are run on the same analyzer using the same procedure as a patient specimen. The control results must fall within the manufacturer's acceptable range. If they do not, the test cannot be run on patient specimens until the problem is identified and resolved.
When to run QC:
- Each day of patient testing (at minimum)
- After opening a new lot of reagents or test strips
- After instrument maintenance or repair
- When results seem inconsistent with the clinical picture
- Per manufacturer and facility policy
Document QC results in the QC log every time — date, time, lot number of controls and reagent, result, acceptable range, and whether it passed or failed. If QC fails, document the corrective action taken.
Keep reagents and test strips within their expiration dates. Store them per manufacturer instructions. Some strips require room temperature storage; others require refrigeration. Check each time you open a new container.
Documenting Results
Every POCT result must be documented in the patient's chart promptly. Include:
- Date and time performed
- Test name and result
- Units (e.g., mg/dL for glucose)
- Reference range
- Whether the result was reported to the provider and when
- Any follow-up action taken
- Your name
Critical Values
A critical value is a result so far outside the normal range that it requires immediate clinical action. Every facility has defined critical value thresholds and a policy for reporting them. Know yours.
Common POCT critical value examples:
- Glucose below 40 mg/dL or above 500 mg/dL
- Hemoglobin below 7 g/dL
- SpO2 below 90%
When you get a critical value: confirm the result is not due to a technical error (was the sample adequate? did QC pass?). If the result is confirmed, notify the provider immediately. Do not leave a message and wait — find the provider. Document the notification: who you told, the time, and the provider's response. This is a safety-critical step and documentation protects the patient and you.