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Hi!
Thank you for your question!
ISUOG has a good guideline on this. From their website:
"Heart. The situs, size and symmetry of the heart should be assessed. The screening examination of the heart involves the four-chamber, outflow-tract and three-vessel-and-trachea views (Figure 2)22. Normal cardiothoracic circumference ratio in the third trimester is approximately 0.45 and should be no greater than 0.50. Mild asymmetry of the ventricles (right > left) and great arteries (pulmonary > aorta) may be normal in the third trimester, but warrants referral for fetal echocardiography if pronounced (Figure 3)22."
https://obgyn.onlinelibrary.wiley.com/doi/10.1002/uog.27538
Assuming they had a detailed morph scan we are looking for outflow changes which might manifest as asymmetry, VSDs which are easier to see when baby is larger, aliasing in 3VT view for heart block. If they didn't have a morph try to do as much as you can and note within limitations of gestational age.
Please note you need to adhere to your department protocols to be covered by insurance, I would consult with your radiologist/senior if they are unclear.
Women's Health SIG