11.5 Point-of-Care and Urinalysis Reference Checklist

Point-of-Care Testing Reference

Point-of-care (POC) testing becomes a trap when a candidate treats a device readout as automatically valid. A CLIA-waived test (Clinical Laboratory Improvement Amendments) is still governed by manufacturer instructions, facility policy, quality control (QC), storage, expiration, specimen type, and timing. Most physician-office tests CCMAs run - glucose, urine dipstick, rapid strep, urine pregnancy, A1c, rapid flu/COVID - fall in the waived category.

Before / During / After

Quality Control Rules

Many devices use two-level QC: a normal (low) and abnormal (high) control run per the manufacturer's schedule and after a new lot or troubleshooting. If a glucose control reads outside its acceptable range, patient testing stops until the issue is fixed (new strips, recalibration, new control). Never report patient results generated under failed QC.

Common POC Traps

• A urine pregnancy device with no control line is invalid, regardless of the test line - repeat with a new device.
• A urine dipstick read too early or too late gives false readings; each pad has its own timed window (glucose ~30 sec, leukocyte esterase ~2 min, etc.) - read at the exact time on the bottle.
• Expired strips, wrong storage (heat, humidity), or insufficient sample volume invalidate the result.
• A poorly collected swab causes false-negative rapid strep/flu results.

Normal Dipstick Values (Recognize Abnormals)

Clean-Catch Midstream Urine

Instruct the patient to wash hands, cleanse the area front to back (females) or the meatus (males), begin voiding into the toilet, then collect the midstream portion without touching the inside of the cup, and seal it. Test promptly (within ~1 hour) or refrigerate; a delayed unrefrigerated specimen overgrows bacteria and falsely raises nitrites and pH.

Last-Minute Self-Test

Glucose Monitoring Specifics

Blood glucose is the most common POC test a CCMA runs, and the exam expects you to recognize critical values and act. Normal fasting glucose is roughly 70-99 mg/dL; 100-125 mg/dL suggests prediabetes and 126 mg/dL or higher on repeat testing supports diabetes. A capillary reading below about 70 mg/dL is hypoglycemia and a reading above the meter's measurable range or with symptoms is hyperglycemia - both are reported promptly. Symptoms of hypoglycemia (shakiness, sweating, confusion, hunger) call for the office hypoglycemia protocol, often 15 grams of fast-acting carbohydrate with a recheck in 15 minutes for a conscious patient.

Always confirm the strip code or calibration matches the meter, because a mismatch produces falsely high or low values.

Hemoglobin A1c and Rapid Tests

Hemoglobin A1c reflects average glucose over roughly three months; below 5.7% is normal, 5.7-6.4% is prediabetes, and 6.5% or higher supports diabetes. Unlike a fingerstick, A1c does not require fasting. Rapid antigen tests for strep, influenza, and COVID-19 depend heavily on collection technique and timing windows; a swab that does not reach the correct site or is read outside its window yields false negatives that can mislead treatment.

CLIA Categories and Operator Responsibility

CLIA sorts tests into waived, moderate-complexity, and high-complexity categories, and the office must hold a CLIA certificate matching the highest-complexity test it performs. Even for waived tests, the operator must follow manufacturer instructions exactly, run required QC, log lot numbers and expiration dates, and document the result with the operator's identity. The exam's recurring lesson is that a result is only as trustworthy as the controls behind it: when QC fails, the kit is expired, or storage was wrong, the result is discarded and the test repeated rather than interpreted or reported.

POC convenience never overrides the validity checks that make the number meaningful.

Microscopic and Confirmatory Follow-Up

A urinalysis has three parts: physical (color, clarity, specific gravity), chemical (the reagent dipstick), and microscopic examination. The CCMA performs the physical and chemical portions as waived testing, but the microscopic exam - identifying red and white blood cells, casts, crystals, and bacteria - is moderate-complexity work performed by qualified personnel, not a routine CCMA task. Knowing that boundary is itself a tested point.

Similarly, a positive waived screen often triggers a confirmatory send-out; for example, a positive POC drug screen is presumptive and is confirmed by the reference lab before any result is treated as definitive, and the CCMA never reports a presumptive screen as a confirmed finding.

Documentation and Reporting Discipline

Every POC result entry should capture the test name, the result, the date and time, the operator's identity, the lot number and expiration when required, and the QC status for that run. Critical values - a dangerously low glucose, a strongly positive infectious test - are reported to the provider promptly and the notification time is recorded. When a result is invalid, document that the test was repeated and why, rather than charting a questionable number.

The recurring exam logic is simple to apply under time pressure: if the stem hints that a control failed, a kit expired, storage was wrong, timing was off, or the specimen was poor, the correct answer repeats or replaces the test - it never interprets, reports, or acts on the suspect value.