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Table 2 First line metabolic work-up

From: Medium-chain Acyl-CoA dehydrogenase deficiency presenting with neonatal pulmonary haemorrhage

Variable

Day 14

Normal range

Ammonia (μg/dl)

113

<228

Plasma amino acids

Normal

Urine organic acids

 Lactate (mmol/mol creat)

76

<79

 3-Hydroxybutryrate (mmol/mol creat)

0

<26

 Acetoacetate (mmol/mol creat)

0

<9

 2-Oxoglutarate (mmol/mol creat)

942

<723

 5-Hydroxyhexanoate (mmol/mol creat)

48

<26

 Adipate (mmol/mol creat)

15

<30

 Hexanoylglycine (mmol/mol creat)

0

<2

 Octanoate (mmol/mol creat)

7

<2

 Sebacate (mmol/mol creat)

20

<4

 Suberate (mmol/mol creat)

20

<11

 Suberglycine (mmol/mol creat)

0

<1

Acylcarnitine profile

  

 Free carnitine (μmol/l)

27.88

17.7 – 48.8

Saturated acylcarnitines

 Hexanoyl carnitine C6 (μmol/l)

1.07

0.09 - 0.26

 Octanoyl carnitine C8 (μmol/l)

4.45

0.05 - 0.23

 Decanoyl carnitine C10 (μmol/l)

0.48

0.06 - 0.31

Unsaturated acylcarnitines

 Decanoyl C10:1 (μmol/l)

1.41

0.04 – 0.25

 Dodecanoyl C12:1 (μmol/l)

0.05

n.d. - 0.20

  1. Table 2. Results from basic metabolic investigations.
  2. Interpretation urine organic acids: Mild hypoketotic dicarboxyluria. Increased excretion of 5-hydroxyhexanoate and octanoate, absense of suspect glycine conjugates (suberylglycine and hexanoylglycine). Normal ratio of adipine, suberine and sebacine acid.
  3. Conclusion : Mildly disturbed profile, not diagnostic. Differential diagnosis includes mild physiologic dicarboxylaciduria in children under 6 months, MCT diet or MCAD deficiency. To be correlated with clinical presentation and acylcarnitine profile.
  4. Interpretation acylcarnitine profile: Raised C6, C8, C10, C10:1 and C12:1.
  5. Conclusion: Disturbed profile compatible with MCAD deficiency.