Point of Care Testing and EKG

✗ "Waived" means simple and unregulated VS waived is a CLIA complexity category with real rules

✓ CMS defines waived as an insignificant risk of an erroneous result — a risk statement, not a permission slip. The site still needs a current CLIA Certificate of Waiver and must follow the current manufacturer's instructions without variation. CDC: waived tests are not error-proof; errors happen when instructions are not followed. Change the instructions or the specimen type and the modified test system defaults to HIGH complexity, with proficiency testing, performance specifications, personnel qualifications and biennial inspection attached.

✗ Calibration VS quality control — and who sets the frequency

✓ Calibration adjusts the instrument against a known standard so its readings are accurate. Quality control runs a specimen with a known expected value to prove the whole system is performing correctly right now. For waived testing the manufacturer's insert sets the frequency of both, and you may never test QC less often than the insert says. Do not import the "at least once each day patient specimens are assayed" rule from 42 CFR 493.1256(d)(3) — that regulation is in Subpart K, the quality system for NONWAIVED testing. If a control is out of range, you do not report patient results.

✗ V5 on the midaxillary line VS V5 on the ANTERIOR axillary line

✓ This is the single most-flipped pair on the exam. AHA: V5 = left ANTERIOR axillary line. V6 = left MIDaxillary line. Both sit on the same horizontal line as V4, not along the slope of the ribs. Mnemonic: the numbers move outward, so V5 (smaller) is the more forward line and V6 (larger) is farther around the side.

✗ V1 and V2 in the 4th intercostal space VS placing them too high in the 2nd or 3rd

✓ Placing V1 and V2 too high, in the 2nd or 3rd intercostal space, is the classic error. It reduces R-wave amplitude in those leads and can produce poor R-wave progression, an rSr' pattern, or a false appearance of anterior infarction. Count down: find the sternal angle, the 2nd rib attaches there, then walk down to the 4th intercostal space every time. Do not eyeball it.

✗ Electrodes VS leads

✓ A standard 12-lead EKG uses 10 electrodes (4 limb, 6 precordial) to generate 12 leads. Leads are calculated electrical views of the heart, not physical wires. Six are limb leads (I, II, III, aVR, aVL, aVF) and six are precordial (V1 to V6). An item that says "apply the 12 leads to the chest" is testing whether you know the difference.

✗ 25 mm/sec VS 10 mm/mV — which number is speed and which is gain

✓ 25 mm/sec is horizontal — paper SPEED, so it governs time: 1 mm small box = 0.04 sec, 5 mm large box = 0.20 sec, five large boxes = 1.00 sec. 10 mm/mV is vertical — GAIN or calibration, so it governs voltage: 1 mV prints a 10 mm tall standardization mark. Speed errors distort rate and intervals; gain errors distort amplitude.

✗ Artifact VS a true dysrhythmia — and reporting VS interpreting

✓ Artifact comes from outside the heart: check the patient first (are they alert, moving, shivering, in distress?), then the electrodes, then the cables and nearby equipment. A flat line in a patient who is awake and talking is a lead-off, not asystole. A CCMA may RECOGNIZE that a tracing looks abnormal or emergent and escalate it — that is task 3F4. A CCMA does NOT interpret the rhythm, diagnose it, or explain it to the patient. Repeat the tracing when it is technically poor; never edit or discard one because it looks bad.

✗ gFOBT dietary restrictions VS FIT (no restrictions)

✓ Guaiac-based FOBT reacts to heme from any source, so certain foods, supplements and medicines can change the result: red meat (beef, lamb, liver), some raw fruits and vegetables, vitamin C in amounts over 250 mg a day, and NSAIDs including ibuprofen, naproxen and aspirin (MedlinePlus/NLM). The exact number of days to avoid each item comes from the kit's instructions and the ordering provider — read them, do not recite a number from memory, and never tell a patient to stop cardiac aspirin without the provider. FIT uses antibodies specific to human hemoglobin, so it needs no special dietary or medication preparation. Do not carry the guaiac instructions over to a FIT kit.

✗ A negative rapid test rules the disease out VS it often does not

✓ Rapid strep (IDSA): a negative rapid antigen detection test in a CHILD or ADOLESCENT should be backed up by a throat culture, because RADT sensitivity runs below 90% and group A strep causes a sizable share of childhood pharyngitis. In adults a backup culture is generally not necessary, because GAS pharyngitis is much less common in adults and the risk of subsequent acute rheumatic fever is exceptionally low. Rapid influenza antigen tests are less sensitive than molecular assays, so a negative does not rule out influenza and treatment decisions belong to the provider. Heterophile (mono) antibodies may still be undetectable if the test is done within 1 to 2 weeks of illness onset; they peak 2 to 5 weeks in (MedlinePlus/NLM), so an early negative may need repeat testing.

✗ Reading the reagent strip whenever you get to it VS at the exact stated second

✓ Each pad has its own manufacturer-defined read time, and the insert states it to the second. Reading early or late lets color continue to develop or fade, changing the reported result. Also blot or drag the strip edge on absorbent paper and hold it horizontally so reagent from one pad does not run into the next — "run-over" produces false values on adjacent pads. Do not leave the strip submerged; dip and remove per the insert.

✗ Any random urine works for hCG VS first morning urine is preferred

✓ First morning urine is the most concentrated and gives the earliest reliable detection. Dilute urine with low specific gravity may not carry a representative hCG level and can produce a false negative, as can testing too soon after conception. If a negative result conflicts with the clinical picture, the provider decides on repeat or serum testing — not you.

✗ Limb electrodes on the torso VS on the distal limbs

✓ For a standard diagnostic 12-lead, limb electrodes belong on the distal limbs (just above the wrists and above the ankles), on flat fleshy tissue and off bony prominences. Torso placement — the Mason-Likar modification used for monitoring and stress testing — reduces movement artifact but changes waveform morphology and can alter the diagnostic reading. It is acceptable to move limb electrodes more proximally to control tremor artifact or during transport, but you must document that the modified placement was used.

✗ The MA reads the urine sediment VS microscopy is Provider-Performed Microscopy

✓ The physical and chemical portions of a urinalysis can be CLIA-waived and are yours to run. The microscopic portion is not waived. Under CLIA it falls in the Provider-Performed Microscopy (PPM) category, restricted to the physician or midlevel practitioner. A CCMA may centrifuge the specimen and set up the slide when office protocol allows, but does not read the sediment and does not report a microscopic result as a finding.