Investigations and Precautions Prior to Implanon Insertion
Among healthy women, no examinations or tests are required before Implanon insertion 1. This is the clear, evidence-based recommendation from the U.S. Selected Practice Recommendations for Contraceptive Use.
Required Pre-Insertion Steps
Essential Precaution: Confirm Non-Pregnancy
The single most critical precaution is ensuring reasonable certainty that the woman is not pregnant 1. This can be established through:
- Insertion within first 5 days of menstrual bleeding (no backup contraception needed)
- Clinical assessment using standard pregnancy checklist criteria
- If uncertainty exists, the benefits of starting the implant likely exceed any risk; proceed with insertion and follow up with pregnancy test in 2-4 weeks 1
Optional Baseline Measurement
Weight and BMI measurement may be useful for monitoring over time, but is not required for safe insertion 1. Obese women can safely use implants (U.S. MEC 1), so screening for obesity is unnecessary for determining medical eligibility 1.
What Is NOT Needed
No Pelvic Examination Required
A pelvic examination is not necessary before implant insertion 1. It would not facilitate detection of conditions making implant use unsafe (such as current breast cancer or certain liver diseases) 1.
No Laboratory Tests Required
The following tests are not needed for healthy women 1:
- Liver enzymes (despite contraindication in certain liver diseases)
- Blood pressure measurement
- STI screening
- HIV testing
- Screening for hypertension, diabetes, hyperlipidemia, anemia, or thrombogenic mutations
Women with these conditions can use or generally can use implants (U.S. MEC 1 or 2), making routine screening unnecessary 1.
Special Populations Requiring Additional Assessment
Women with known medical problems or special conditions may need additional examinations or tests before insertion 1. Consult U.S. Medical Eligibility Criteria (U.S. MEC) in these circumstances.
Absolute Contraindications (U.S. MEC 4)
- Current breast cancer 1
Relative Contraindications (U.S. MEC 3)
- Certain liver diseases 1
Critical Insertion Technique Precautions
While not "investigations," the evidence strongly emphasizes these procedural precautions to prevent complications:
Proper Training Required
Providers must receive proper training in insertion technique 2, 3, 4. The most common cause of "contraceptive failure" is actually failure to insert the implant (accounting for 84 of 127 analyzed pregnancy cases in one series) 2.
Correct Anatomical Placement
- Insert subdermally in the inner aspect of the non-dominant upper arm
- Avoid deep insertion to prevent nerve injury 5, 6
- Medial cutaneous nerve of the forearm is at risk with improper technique 5
Post-Insertion Verification
Palpate the arm immediately after insertion to confirm implant presence 7. This simple step prevents the most common cause of unintended pregnancy with implants.
Timing Considerations
- Days 1-5 of menstrual cycle: No backup contraception needed
- After day 5: Requires 7 days of abstinence or backup contraception 1, 8
- Postpartum, postabortion, and method-switching have specific timing requirements detailed in guidelines 1
Common Pitfalls to Avoid
- Ordering unnecessary tests that delay insertion and create barriers to access
- Requiring pelvic examination when not indicated
- Inadequate provider training leading to non-insertion or deep placement 2, 3
- Failing to palpate post-insertion to verify presence 7
- Incorrect timing without appropriate backup contraception 3
Counseling Requirements
Before insertion, counsel patients about:
- Expected bleeding pattern changes (unscheduled spotting, amenorrhea) 1
- When to return for removal (3 years for Implanon)
- Signs requiring follow-up
- No routine follow-up visit is required after insertion 1
The evidence consistently demonstrates that minimizing pre-insertion requirements improves access to this highly effective contraceptive method without compromising safety.