What is the appropriate workup for a patient with suspected diastasis recti?

Workup for Diastasis Recti

The diagnosis of diastasis recti is primarily clinical, made through physical examination with direct measurement of the inter-rectus distance using a caliper or ruler, and imaging should be reserved for cases where concurrent hernias or alternative diagnoses need to be excluded. 1

Clinical Examination

The cornerstone of diagnosis is a focused physical examination with quantitative measurement:

• Measure the inter-rectus distance at multiple anatomical landmarks using a caliper or ruler during active abdominal contraction (such as a partial sit-up or head lift)
• Key measurement points include:
  • Xiphoid process (M1)
  • 3 cm above umbilicus (M2)
  • At umbilicus (M3) - most common site of maximal separation
  • 2 cm below umbilicus (M4)
  • Midpoint between umbilicus and pubis (M5)
• Palpate for fascial defects to distinguish true diastasis (no fascial defect, just widened linea alba) from concurrent hernias
• Assess for visible midline bulging with straining or trunk flexion 2, 3

The diagnosis is confirmed when the inter-rectus distance exceeds 2 cm at any measurement point 4. Document both the width and length (number of sites involved) as this guides treatment decisions 5.

Role of Imaging

Imaging is not routinely necessary for diagnosis but has specific indications:

When to Order Imaging:

• Suspected concurrent umbilical or epigastric hernia that cannot be definitively excluded on physical exam 1
• Surgical planning when repair is being considered - helps classify severity and anatomical extent 2
• Unclear diagnosis or when alternative causes of abdominal symptoms need evaluation 1

Imaging Modality Selection:

• Ultrasound is the preferred first-line imaging modality when needed:

  • Non-invasive, no radiation exposure
  • Can measure inter-rectus distance dynamically during contraction
  • Validated for classification and treatment planning 5
  • Particularly useful in postpartum women where radiation should be avoided

• CT or MRI are reserved for:

  • Complex cases requiring detailed surgical planning
  • When other intra-abdominal pathology is suspected
  • Evaluation of concurrent ventral hernias 2

Laboratory Testing

No laboratory tests are indicated for diastasis recti workup. This is a structural/anatomical diagnosis that does not require biochemical investigation 1.

Common Pitfalls to Avoid

1. Don't confuse diastasis recti with ventral hernia - diastasis has no fascial defect, just widened linea alba. Careful palpation distinguishes these conditions.

2. Don't order imaging reflexively - the 2021 Swedish consensus specifically recommends against routine imaging unless hernias or other pathology need exclusion 1.

3. Measure during active contraction, not at rest - the separation is most apparent and clinically relevant when the rectus muscles are engaged.

4. Document multiple measurement points - the width-length classification based on how many anatomical sites are involved (M1-M5) has been validated to guide treatment decisions 5.

Clinical Context Considerations

In pregnant or postpartum women, the Canadian guideline notes that continuing aerobic exercise like walking decreases odds of developing diastasis recti, and women with visible separation should avoid abdominal strengthening exercises (like crunches) that may worsen the condition 6. However, this is management advice rather than diagnostic workup.

The workup algorithm is straightforward: physical examination with measurement → imaging only if hernias suspected or surgical planning needed → no laboratory testing required.