Miscarriage Tissue Testing: Cost, Preservation, and What the Results Mean

Why Test Miscarriage Tissue

Chromosomal abnormalities cause roughly 50 to 60 percent of first-trimester miscarriages. Testing the tissue (called products of conception, or POC testing) can tell you whether the loss was caused by a random genetic error — a trisomy, monosomy, or triploidy that happened during fertilization — or whether something else needs investigation.

For a first miscarriage, POC testing is often optional. Many providers do not recommend it unless you specifically request it. After two or more spontaneous losses, a provider may discuss a recurrent-pregnancy-loss evaluation; ask whether testing the tissue would help in your situation.

The results change what happens next. A random trisomy (like trisomy 16, the most common) tells you the loss was unlikely to recur for the same reason. A balanced translocation in the tissue suggests parental carrier testing is warranted. Normal results shift the investigation toward uterine anatomy, thyroid function, or autoimmune factors.

How to Preserve Tissue at Home

If you miscarry at home and want chromosomal testing, you have a narrow window — roughly 24 to 72 hours — to get viable tissue to a lab.

Identify the tissue. Gestational tissue is firm, fibrous, and pinkish-gray or tan. Blood clots are soft, deep red, jelly-like, and fall apart when touched. You're looking for the firmer, more solid material.

Collection: Use a clean collection basin or a sterile specimen cup. If you're passing tissue in the toilet, place a clean collection basin under the seat beforehand. Transfer any tissue to a sterile container, and ask your provider or lab about its collection requirements.

Preservation solution: Place the tissue in sterile normal saline (0.9% sodium chloride solution, available at pharmacies as wound irrigation solution). Do not use plain water — it causes osmotic cell lysis and destroys the sample. Do not use formalin or formaldehyde — these kill cells and make karyotyping impossible.

Storage: Refrigerate at 39°F to 46°F (4°C to 8°C). Never freeze the tissue. Ice crystal formation ruptures cell membranes, destroying cell viability for culture-based testing.

Transport: Get the sample to your provider or a pathology lab within 24 to 72 hours. Call ahead to confirm whether the lab can arrange POC testing and what container, preservation, and paperwork it requires. The research report names Natera's Anora test and Igenomix as testing options.

Types of Testing and What They Cost

Microarray has largely replaced standard karyotyping in many labs because it doesn't require live cells to grow in culture — which means it works even when the tissue sample is suboptimal. It also catches smaller genetic changes that karyotyping misses.

Insurance Coverage

Insurance coverage for POC testing varies widely. Many carriers classify it as elective after a first miscarriage and deny the claim. After two or more documented losses (ICD-10 code N96, recurrent pregnancy loss), coverage is more likely.

Before submitting a specimen, call your insurance and ask specifically about CPT code 81228 (CMA for POC) or 88261-88264 (karyotyping). Get the answer in writing if possible. If the claim is denied, request the denial reason in writing and file a formal appeal — the After a Miscarriage toolkit includes an insurance appeals log with template language for this exact scenario.

The Ultrasound Question: Retained Products of Conception

After a miscarriage — particularly after expectant or medical management — your provider may order a transvaginal ultrasound to check whether tissue remains in the uterus. An endometrial thickness greater than roughly 15mm, or the presence of echogenic material with vascularity, may suggest retained products of conception (RPOC).

RPOC can cause prolonged bleeding, infection, or incomplete hormonal recovery (persistently positive pregnancy tests). Treatment depends on the amount of retained tissue: small amounts may pass on their own with monitoring, while larger or symptomatic RPOC typically requires a D&C or uterine aspiration.

If your provider recommends a follow-up ultrasound, it's usually scheduled two to four weeks after the loss. This timing allows the uterus to contract and most tissue to pass naturally, giving a clearer picture of whether intervention is needed.