29 May 2026
: Case report 
Laparoscopic Reversal of One-Anastomosis Gastric Bypass After Sleeve Gastrectomy: A Case Report
Unusual clinical course, Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Unexpected drug reaction, Educational Purpose (only if useful for a systematic review or synthesis)
Ayman Ahmed Sakr
ABCDE 1,2*, Malik Zweed Almutairi CF 3, Azdashir Fadhel Hawash CG 1, Ali Alhussain Alsahhari CD 1
DOI: 10.12659/AJCR.952517
Am J Case Rep 2026; 27:e952517
Table 1 Laboratory findings for the patient before and after revisional surgery.
| Laboratory parameter | Reference value | Before OAGB reversal | After OAGB reversal | ||
|---|---|---|---|---|---|
| 30/01/2024 | 16/05/2024 | 17/05/2024 | 15/10/2024 | ||
| Magnesium | 0.66~1.07 mmol/L | 0.4 | 0.54 | 0.75 | 0.46 |
| Phosphate, serum | 0.78~1.65 mmol/L | 0.99 | 1.1 | 0.99 | 1.7 |
| Bilirubin conjugated serum | ≤5 μmol/L μmol/L | 7.7 | 13.8 | 27 | 18.31 |
| Total bilirubin serum | >5 days–60 years (5–21 μmol/L), 60–90 years (3–19 μmol/L), >90 years (3–15 μmol/L) | 11.3 | 19.9 | 42 | 29.87 |
| Calcium, serum | 2.08~2.65 mmol/L | 1.97 | 2.20 | 2.04 | 2.13 |
| Creatinine, serum | 49~90 μmol/L | 55 | 35 | 33 | 25 |
| Sodium, serum/plasma | 136~145 mmol/L | 140 | 140 | 134 | 141 |
| Potassium, serum/plasma | 3.5~5.1 mmol/L | 4.25 | 2.89 | 3.71 | 4.6 |
| C reactive protein | 0~5 mg/L | 1.3 | 0.5 | 6.58 | 0.4 |
| WBC | 4.5~11×10/L | 7.6 | 3.86 | 12.74 | 5.64 |
| HGB | 12.0~17.0 g/dL | 14 | 11.7 | 11.1 | 14.3 |
| MCV | 80~100 fL | 91.6 | 94 | 94.4 | 95.8 |
| MCH | 26.0~34.0 pg | 31.7 | 33.6 | 32.8 | 31.8 |
| PLT | 150.0~400.0×10/L | 291 | 265 | 177 | 362 |
| Ferritin | 10~291 ng/mL | 156 | 325 | 703 | 584.3 |
| CPK | 0~170 U/L | 27 | 32 | 113 | 33 |
| LDH | 135~214 U/L | 281 | 207 | 354 | 195 |
| OAGB – one-anastomosis gastric bypass; WBC – white blood cells; HGB – hemoglobin; MCV – mean corpuscular volume; MCH – mean corpuscular hemoglobin; PLT – platelets; CPK – creatine phosphokinase; LDH – lactate dehydrogenase. | |||||