How to Write a Sig for a Home Glucometer
Write the sig as: "Check blood glucose [frequency] as directed" or specify the exact testing schedule (e.g., "Check blood glucose before meals and at bedtime" or "Check blood glucose once daily in the morning").
Key Prescribing Considerations
The sig should reflect the patient's insulin regimen and diabetes management intensity:
For Patients on Intensive Insulin Therapy
- Prescribe frequent testing (at least 4 times daily) for patients using multiple daily injections or insulin pump therapy 1
- Example sig: "Check blood glucose before meals and at bedtime (4 times daily)"
- This aligns with evidence from the DCCT showing that intensive glycemic control with frequent BGM decreases microvascular complications 1
For Patients with Type 2 Diabetes on Oral Agents Only
- Routine BGM is not recommended for patients treated with diet and/or oral agents alone 1
- If prescribed despite this, use minimal frequency (e.g., "Check blood glucose once daily in the morning" or "Check blood glucose as directed by provider")
Practical Sig Writing Tips
Be specific and unambiguous to avoid pharmacy callbacks and patient confusion 2:
- Avoid vague instructions like "use as directed" without context
- Specify the frequency clearly (once daily, twice daily, four times daily, etc.)
- Include timing if relevant (before meals, at bedtime, fasting)
Common Pitfalls to Avoid
- Never use glucometers for diabetes diagnosis - they are monitoring tools only, not diagnostic devices 1
- Don't prescribe routine BGM for non-insulin-using type 2 diabetes patients, as this represents unnecessary expense without clear benefit 1
- Avoid ambiguous language that could lead to misinterpretation at the pharmacy 2
Additional Prescription Elements
Include on the prescription:
- Quantity: Specify number of test strips needed based on testing frequency (e.g., 100 strips for ~1 month if testing 4x daily)
- Refills: Typically ongoing refills for chronic monitoring
- Lancets: Consider writing a separate prescription for lancets with appropriate quantity
The sig clarity directly impacts patient safety and workflow efficiency - approximately 10% of prescriptions with unclear directions require pharmacy callbacks 2, so precision in your sig writing prevents delays in patient care.