2.2 Prepare the Patient for Tests

After you identify the correct patient, Work Area I-D asks whether you prepared that patient appropriately for the ordered tests. Preparation is a preanalytical variable: the stick can be flawless, but results will mislead clinicians if the patient ate when fasting was required, exercised before a cardiac enzyme draw, or remained supine when orthostatic sampling rules apply. AMT scenarios often embed prep mistakes inside a longer collection stem — read fasting flags, drug panels, and timing notes on the requisition before you uncap a needle.

Why Preparation Belongs at the Bedside

Laboratory reference intervals assume controlled patient conditions. When those conditions are violated:

• Glucose and lipids rise after meals.
• Potassium can shift with fist pumping and tourniquet time.
• Therapeutic drug monitoring (TDM) reflects trough vs peak depending on last dose timing.
• Hormone tests (cortisol, renin) vary with posture, stress, and diurnal rhythm.

The phlebotomist's job is to confirm prep requirements, explain what will happen, verify the patient is in the correct state, and document deviations — not to reinterpret medical orders, but to catch obvious non-compliance before an invalid specimen is collected.

Fasting and Basal-State Requirements

Fasting verification script:

1. Read the requisition for fasting notation.
2. Ask: "When did you last eat or drink anything other than water?"
3. If the patient reports food, coffee with cream, alcohol, or caloric drinks within the window, stop and notify nursing/ordering provider per policy — do not quietly draw "anyway."
4. Document non-fasting status if an authorized provider orders collection despite violation.

Water is usually permitted during fasting unless the order says otherwise. Chewing gum, mints, and smoking can affect some assays — follow lab-specific rules on the requisition.

Basal State and Posture

Some tests require a basal or rested state:

• Cortisol (AM): Often drawn early morning; stress and recent exertion elevate levels.
• Renin/aldosterone: May require supine rest before draw — follow exact protocol.
• Orthostatic vitals-related labs: Timing relative to position change matters.

Ask the patient whether they ran up stairs, smoked, or had caffeine immediately before the appointment when the order emphasizes rested collection. If requirements are not met, escalate rather than collecting a specimen the clinician cannot interpret.

Medications, Supplements, and Timing

Phlebotomists do not independently tell patients to stop prescribed medications unless facility policy and the order explicitly allow it. Instead:

• Read requisition notes ("draw trough before morning dose," "hold biotin 72 hours," "draw 12 hours post-dose").
• Ask the patient about recent doses relevant to TDM or toxicology.
• Clarify with nursing or the lab when the patient reports unexpected timing.
• Document last known dose time on the collection record when required.

Exam trap: Choosing "tell the patient to skip all medications for 24 hours" without physician order is wrong. The correct answer usually involves verifying timing against the order and notifying the provider when prep was not followed.

Explaining the Procedure

Informed, calm patients cooperate better and experience fewer adverse reactions. Before collection:

1. Introduce yourself and your role.
2. Describe what you will do: tourniquet, cleanse site, brief pinch, number of tubes.
3. Set expectations: possible bruising, need to hold still, bandage afterward.
4. Invite questions and confirm understanding.
5. Position the patient safely — seated with chair locked, arm supported, or supine if history of syncope.

Use plain language, not jargon. For pediatric patients, explain at the child's developmental level; use parents to model calm behavior. For anxious patients, allow a moment to breathe; avoid rushing, which increases vasovagal risk.

Special instructions on the requisition (24-hour urine start, timed cortisol, glucose drink steps) belong to preparation too — confirm the patient completed prior steps before you collect the blood portion.

Patient Refusal

After identification and explanation, a competent adult may refuse venipuncture or capillary collection.

Exceptions are rare and legally defined (certain forensic, court-ordered, or emergency contexts) — exam items usually test that standard outpatient phlebotomy stops on refusal. Pediatric refusal may involve parental consent frameworks; follow facility policy and do not physically force a child without authorized protocols.

If refusal is due to prior bad experience or fear of needles, empathetic explanation and positioning may convert refusal to consent — but the decision remains the patient's when they have decision-making capacity.

Special Populations

Pediatric Patients

• Schedule draws when the child is rested, not immediately post-nap battle or hunger meltdown when avoidable.
• Confirm fasting with parents — children may have snacked unknowingly to the caregiver.
• Use distraction, warmth, and appropriate device size; preparation includes explaining to both child and guardian.
• Heel-stick and small-volume rules interact with prep — do not stack unnecessary tests on limited volume.

Geriatric Patients

• Hearing, vision, and cognitive changes require slower explanation and verification.
• Dehydration makes veins fragile — hydration advice may be part of prep when not contraindicated.
• Fasting may be risky for frail elders — if a diabetic patient reports hypoglycemic symptoms while fasting, stop and notify nursing immediately.

Patients With Disabilities or Language Barriers

• Allow extra time; use certified interpreters for informed prep discussion when required.
• Positioning and support devices (wheelchair, splint) are part of physical preparation for a safe draw.

Pregnant Patients

• Confirm gestational-age-specific orders (glucose screening windows, etc.).
• Standard venipuncture prep applies; emotional reassurance is part of preparation.

Linking Prep to the Collection Moment

A practical I-D checklist before the needle:

1. Correct patient identified (I-A complete).
2. Requisition reviewed for fasting, timing, and special notes.
3. Patient confirms prep compliance; discrepancies escalated.
4. Procedure explained; questions answered.
5. Patient positioned; supplies and tubes ready.
6. Refusal or inability to comply documented and communicated if collection cannot proceed.

When prep is wrong, the best specimen is often the one not collected until conditions are corrected — rescheduling beats reporting a misleading potassium or glucose.

AMT RPT Exam Traps (I-D)

• Drawing a fasting lipid panel after the patient admits to breakfast
• Telling patients to stop all medications without an order
• Ignoring "trough" timing on a TDM requisition
• Proceeding after clear refusal without documentation
• Skipping explanation for anxious patients (increases syncope risk — ties to safety domains)
• Assuming outpatient chemistry never requires fasting

Preparation is less glamorous than venipuncture technique, but I-D separates technicians who protect result quality from those who only fill tubes.