Combined Ammonia & Potassium Specimen Collection: Lithium Heparin Tubes
Collecting Ammonia and Potassium in Same Lithium Heparin Tube
Yes, both specimens can be drawn into a single lithium heparin tube if:
- Tube is filled to the correct volume (proper blood‑to‑anticoagulant ratio).
- Label includes: patient name, MRN, date/time, and specifies both tests (e.g., "Ammonia & Potassium").
- Sample is mixed gently (8–10 inversions) immediately.
- Plasma separated promptly (ammonia degrades rapidly; keep on ice).
Follow lab‑specific protocols; some labs prefer separate tubes to avoid pre‑analytical interference.
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