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Point-of-Care Blood Glucose Monitoring

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Point-of-Care Blood Glucose Monitoring

Key Points

  • Bedside glucose monitoring guides medication and nutrition decisions in patients with diabetes and stress hyperglycemia.
  • Typical inpatient frequency is before meals and bedtime, with additional checks by order/policy (for example every 6 hours with enteral feeding pathways).
  • Technique quality affects reliability: warm/perfused site, full alcohol dry time, no finger milking, and prompt strip application.
  • Use protocol-based escalation for abnormal values, including hypoglycemia rescue and ketone assessment in marked hyperglycemia.
  • Device calibration, post-use disinfection, and complete documentation are required safety steps.
  • Review bleeding-risk context (for example anticoagulant therapy) and apply longer puncture-site pressure when needed.

Equipment

  • Glucometer approved for bedside use
  • Compatible reagent strips and control/calibration materials per policy
  • Single-use lancet device
  • Alcohol swabs, gauze, gloves, and bandage as needed
  • Sharps container and documentation access (MAR/EHR)

Procedure Steps

  1. Verify order details, testing frequency, patient identity, and applicable protocol (for example sliding-scale insulin pathway).
  2. Perform hand hygiene, apply clean gloves, and confirm manufacturer/policy setup requirements for the device.
  3. Assess factors that may affect interpretation before puncture: fasting/eating status, hypo/hyperglycemia symptoms, timing of recent insulin/carbohydrate intake, and medications that can affect bleeding at the puncture site (for example anticoagulants).
  4. Prepare and quality-check the glucometer per policy (including calibration/control workflow when required).
  5. Ask the patient to wash hands with soap and warm water when feasible, then position seated or semi-upright; avoid standing collection because near-syncope/fall risk can increase.
  6. Select puncture site by age and policy:
    • Adults/older children: fingertip capillary site (lateral finger surface preferred).
    • Newborns/infants up to about 6 months: heel site (medial or lateral plantar surface).
  7. Promote capillary flow before puncture: keep hand dependent and warm; if needed, use warm water exposure, brief dependent hand dangling (about 15 seconds), or a warm compress/towel (about 10 minutes) per policy.
  8. Choose finger site carefully: avoid fingertip pads and use lateral sides; avoid calloused, bruised, or broken skin sites; avoid contraindicated limb use (for example same-side arm/hand after mastectomy when policy indicates alternative-site use).
  9. Cleanse site with alcohol for about 30 seconds and allow full dry time.
  10. Perform lancet puncture using device-specific depth/activation technique.
  11. If needed, gently squeeze above the puncture site to form a drop; do not milk or massage the finger because tissue-fluid contamination and hemolysis can occur.
  12. Wipe away the first blood drop and use the second drop for strip collection, following meter timing requirements to avoid clotting or timeout errors.
  13. Complete meter readout, provide local site care, and ensure patient comfort/safety.
  14. Interpret result with current symptoms and ordered protocol:
  • If glucose is below 70 mg/dL, start facility hypoglycemia protocol (commonly 15 g carbohydrate and recheck in 15 minutes for patients who can swallow).
  • If glucose is above 240 mg/dL, follow policy for ketone assessment and escalate for possible ketoacidosis concerns.
  1. If insulin is ordered from a correction/sliding protocol, complete medication-right verification and administer per order/policy.
  2. Dispose of lancet in sharps container, disinfect the glucometer per policy, and perform hand hygiene.
  3. Document result, site, timing, symptoms, interventions, reassessment, and required provider/team notifications; report critical values per policy (for example below 70 mg/dL or above 300 mg/dL) with associated symptoms.

Special Considerations

  • Delegation: In some settings, trained assistive personnel may perform fingerstick collection; RN accountability includes order verification, interpretation, and escalation.
  • Clinical context: Do not interpret a number in isolation; trends plus symptoms determine urgency.
  • Severe hypoglycemia: If swallowing is unsafe, follow emergency protocol for glucagon or IV dextrose pathways.

Common Errors

  • Using an uncalibrated or improperly prepared meter → inaccurate result risk.
  • Sampling before alcohol dries → stinging and potentially altered sample quality.
  • Milking/massaging finger or using first drop → diluted/hemolyzed specimen risk.
  • Delay between puncture and strip application → clotting/timeout and invalid reading.
  • Failing to escalate severe hypo/hyperglycemia symptoms → preventable deterioration risk.
  • Using contraindicated/poor-quality puncture sites (fingertip pad, bruised/calloused/broken skin, restricted-side limb) → painful collection and unreliable sample risk.
  • Missing documentation of site/time/action → unsafe continuity and insulin-dosing errors.

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