NORMAL VALUES

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 1.             Normal pyloric muscle single wall thickness : <3 mm (measured on transverse image). 

 2.             Normal pyloric channel length : <15-17 mm. [ π = 3.14]  

3.             A gestational sac should be identified when beta HCG value exceeds 1000 mIU/mL.  

4.             Quantitative beta HCG reference range 0-2 WKS:  7-500 mIU/mL           5.             Quantitative beta HCG reference range 2-3 WKS:  100-1000 mIU/mL          

6.             Quantitative beta HCG reference range 3-4 WKS:  500-6000 mIU/mL           

7.             Quantitative beta HCG reference range 1-3 Months:  5000-200,000 mIU/mL           

8.             Quantitative beta HCG reference range 2nd trimester:  3000-50,000 mIU/mL           

9.             Quantitative beta HCG reference range 3rd trimester:  1000-50,000 mIU/mL  

10.         A yolk sac should be identified in a gestational sac measuring 8 mm (TV) or 20 mm (TA).  11.         An embryo should be identified in a gestational sac measuring 18 mm (TV) or 25 mm (TA)  12.         Heart rate should be identified in an embryo measuring greater than 5 mm.  

13.         Normal range for yolk sac size 2 to 6 mm  

14.         Upper limits for fetal renal pelvis size is 4 mm before 23 weeks and 7 mm after 23 weeks.  15.         Upper limit for cerebral lateral ventricle atrium size is 10 mm.  

16.         Upper limit for nuchal translucency is 3 mm (measured at 10-14 weeks gestational age)  

17.         Upper limit for nuchal thickness is 6 mm (measured at 16-22 weeks gestational age)  

18.         Physiologic bowel herniation is seen between 8-12 weeks of gestational age.  

19.         Normal range for fetal cisterna magna size is 2-10 mm.  

20.         Size of interposed membrane to diagnose dichorionic-diamniotic twins is > 2 mm.  21.         Fetal stomach reliably visualized around 19 weeks.  

22.         Fetal swallowing usually seen starting around 11 weeks.  

23.         Percentage of contralateral renal anomalies seen in fetus diagnosed with multicystic dysplastic kidney is 40%.  

24.         Normal placental thickness is < 4 cm.  

25.         Cervical incompetence: cervical length is < 2 cm. borderline at 2-3 cm; normal > 3 cm.  

26.         Endometrial thickness upper limit in premenopausal women - 16 mm  

27.         Endometrial thickness upper limit in perimenopausal women - 13 mm  

28.         Endometrial thickness upper limit in postmenopausal women - 5 mm  

29.         Endometrial thickness upper limit in postmenopausal women on HRT - 8 mm.  

30.         Size of simple ovarian cyst in women of reproductive age that need not be described in the US exam report - < 3 cm.  

31.         Size of simple ovarian cyst in women of reproductive age that need to be described but need not followed up -  3 -5cm.  

32.         Size of simple ovarian cyst in women of reproductive age that need to be described & followed in a year on -  5 - 7 cm  

33.         Size of simple ovarian cyst in women of reproductive age that need further imaging w/ MR or surgical consult - > 7 cm  

34.         Size of simple ovarian cyst in post-menopausal women that need not be described in the US exam - < 1 cm  

35.         Size of simple ovarian cyst in post-menopausal women that need to be described & followed in a year -  1 to 3 cm  

36.         Size of simple ovarian cyst in post-menopausal women that need further imaging w/ MR or surgical consult - > 7 cm  

37.         Velocity criteria for diagnosing > 70% ICA stenosis - ICA PSV > 230 cm/sec; ICA EDV > 100 cm/sec; ICA/CCA PSV ratio > 4.  

38.        Velocity criteria for diagnosing 50-69% ICA stenosis - ICA PSV > 125 cm/sec; ICA EDV 40-100 cm/sec; ICA/CC PSV ratio 2-4.  

39.         TIPS stenosis suggestive parameters: 1. Portal vein end velocity < 50 cm/s; 2. Change of 50 cm/s. from baseline. 3. Reversal of flow.  

40.         Normal velocity in the mid TIPS is 120 (+/- 5-10) cm/sec.  

41.         Velocity criteria for diagnosing >70% SMA stenosis is reported as > 275 cm/sec.  

42.         Transplant renal artery velocities:  Normal: </= 150 cm/sec; normal upper limits = 200 cm/sec; abnormal > 200 cm/sec.  

43.         Renal transplant resistive indices: Normal < 0.7; Indeterminate 0.7 - 0.8; abnormal > 0.9.  

44.         Normal velocity range for main portal vein 16 - 40 cm/s  

45.         Doppler criteria for renal artery stenosis - Direct - Main Renal Artery - PSV >1.8 m/s  

46.         Doppler criteria for renal artery stenosis - Direct - Main Renal Artery - Renal aortic ratio >3.0  

47.         Doppler criteria for renal artery stenosis - Indirect - Intrarenal arteries - Acceleration Index (AI) <3.0  

48.         Doppler criteria for renal artery stenosis - Indirect - Intrarenal arteries - Acceleration Time (AT) >70 ms  

49.         Doppler criteria for renal artery stenosis - Indirect - Combined - Renal Interlobar Ratio (RIR) > 5.  

50.         Doppler criteria for renal artery stenosis - Indirect - Combined - PSV in interlobar artery <15 cm/s  

51.         Normal gallbladder wall thickness 3 mm.  

52.         Normal CBD 2 to 6 mm; add 1 mm for each decade above 40 to the allowed maximum.  

53.         Gallbladder ejection fraction on hepatobiliary scintigraphic imaging - 35-75%.