ABG-HEPARIN-DILUTION medical runtime_error ai_generated true

AI instructs to use heparinized syringe for arterial blood gas from an arterial line, causing inaccurate results

ID: medical/art-line-blood-gas-heparin

Also available as: JSON · Markdown · 中文
90%Fix Rate
87%Confidence
1Evidence
2024-08-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Radiometer ABL90 FLEX active — — —
Siemens RAPIDPoint 500 active — — —
GEM Premier 5000 active — — —
BD Vacutainer PST active — — —

Root Cause

Arterial line dead space contains heparinized flush solution; aspirating 3-5 mL discard before sample is mandatory. Using heparinized syringes for the discard or adding excess heparin can dilute the sample, causing falsely low pCO2, pO2, and electrolytes.

generic

中文

动脉导管死腔含有肝素化冲洗液；必须在采样前抽出3-5 mL弃去。对弃去液使用肝素化注射器或添加过多肝素可能稀释样本，导致pCO2、pO2和电解质假性降低。

Official Documentation

https://www.radiometer.com/en-us/blood-gas-testing/arterial-blood-gas-sampling

Workarounds

  1. 95% success Use a non-heparinized syringe for the discard sample. After discarding 3-5 mL (or 2x dead space), attach a fresh non-heparinized syringe to collect the ABG sample. If using a pre-heparinized syringe, ensure the liquid heparin is fully expelled before filling with blood. 
    Use a non-heparinized syringe for the discard sample. After discarding 3-5 mL (or 2x dead space), attach a fresh non-heparinized syringe to collect the ABG sample. If using a pre-heparinized syringe, ensure the liquid heparin is fully expelled before filling with blood.
  2. 90% success Alternatively, use a balanced heparin syringe (e.g., PICO70) with minimal liquid heparin, and fill to the exact mark without excess. Do not use additional liquid heparin. 
    Alternatively, use a balanced heparin syringe (e.g., PICO70) with minimal liquid heparin, and fill to the exact mark without excess. Do not use additional liquid heparin.

中文步骤

  1. 使用非肝素化注射器采集弃去样本。弃去3-5 mL（或2倍死腔体积）后，连接新的非肝素化注射器采集ABG样本。如果使用预肝素化注射器，确保在采集血液前完全排出液体肝素。
  2. 或者，使用平衡肝素注射器（如PICO70），其液体肝素含量极少，并精确填充至标记线，不要过量。不要额外添加液体肝素。

Dead Ends

Common approaches that don't work:

  1. 65% fail

    Excessive discard volume can cause iatrogenic anemia in small patients and does not fix the heparin contamination if the syringe itself is heparinized.

  2. 80% fail

    This can cause hemolysis and air bubble introduction, further corrupting pO2 and potassium values.