2S [LAB]: Magnesium Flashcards

1
Q

4th most abundant cation in the body

A

Magnesium

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2
Q

2nd most abundant intracellular ion

A

Magnesium

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3
Q

How many percent of magnesium is present in the bone?

A

53%

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4
Q

How many percent of magnesium is present in the muscle, other organs, and soft tissues?

A

46%

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5
Q

How many percent of magnesium is present in the serum?

A

<1%

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6
Q

1/3 of magnesium in the serum is bound to ___

A

Proteins (albumin)

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7
Q

Which organ is responsible in the overall regulation of Mg2+?

A

Kidneys

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8
Q

Which hormone increases renal and intestinal Mg2+ reabsorption?

A

Parathyroid hormone

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9
Q

Hormones that increases renal excretion of Mag2+

A

Aldosterone
Thyroxine

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10
Q

The principle of total Mg2+ determination

A

Colorimetric

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11
Q

The most frequent colorimetric method used for Mg2+ determination

A

Methylthymol blue or Magon or Xylidyl blue

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12
Q

The Formazan dye in Mg2+ determination has an end color of ___

A

Red

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13
Q

The Calmagite method in Mg2+ determination has an end color of ___

A

Reddish violet

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14
Q

Reference method for Mg2+ determination

A

Atomic Absorption spectrophotometer

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15
Q

Anticoagulant preferred in Mg2+ determination

A

Lithium heparin

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16
Q

Anticoagulants discouraged in Mg2+ determination

A

EDTA
Oxalate
Citrate

17
Q

Preferred urine specimen for magnesium determination

A

24 hr urine

18
Q

Reference range of Mg2+ in serum

A

0.63-1.0 mmol/L

19
Q

Ion that acts as a cofactor of cellular enzymes and is important in DNA replication and transcription

20
Q

Important in ion transport and nerve conduction

21
Q

How many percent of magnesium is reabsorbed in the DCT?

22
Q

How many percent of magnesium is reabsorbed in the ascending limb?

23
Q

How many percent of magnesium is reabsorbed in the PCT?

24
Q

Identify the effect on magnesium:

Hyperthyroidism/ Hyperparathyroidism

A

Hypomagnesemia

25
Q

Identify the effect on magnesium:

Hyperaldosteronism

A

Hypomagnesemia

26
Q

Identify the effect on magnesium:

Hypercalcemia

A

Hypomagnesemia

27
Q

Identify the effect on magnesium:

Diabetic ketoacidosis

A

Hypomagnesemia

28
Q

Identify the effect on magnesium:

Diuretics

A

Hypomagnesemia (drug-induced)

29
Q

Identify the effect on magnesium:

Excess lactation and pregnancy

A

Hypomagnesemia (miscellaneous)

30
Q

The Calmagite method of magnesium determination uses what wavelength?

31
Q

The Formazan dye of magnesium determination uses what wavelength?