Spinal cord infarction attributed to SARS-CoV-2, with post-acute sequelae of COVID-19: A case report

Table 1 Laboratory indices of rheumatologic disorders

Specific test	Individual result (normal range)	Test results in context of undifferentiated connective tissue disease[16]
Anti-Smith antibody	< 0.2 AI (≤ 0.9)	Highly sensitive for SLE
Anti-DS DNA	< 12 IU/mL (< 30)	Specific to SLE
SSA Ab (anti-Ro AB)	< 0.2 AI (≤ 0.9)	Seen as elevated in 90% of those with Sjogren’s and in 40%-50% of those with SLE
SSB AB (anti-La Ab) anti	< 0.2 AI (≤ 0.9)
Scleroderma Ab IgG	< 0.2 AI (≤ 0.9)	Specific to scleroderma but can be found as positive in combined rheumatologic disorders
Jo-Ab	< 0.2 AI (≤ 0.9)	Positive in dermatomyositis and polymyositis and in other CTD
Ribosomal RNP	< 0.2 AI (≤ 0.9)	Nonspecific index seen in SLE and other rheumatologic disorders
Scleroderma AB IgG	< 0.2 AI (≤ 0.9)	Specific to scleroderma

Artificial intelligence risk calculations were used to indicate likelihood of positivity. Tests were done using multiplex flow immunoassay. More specific units were not given by the reference lab but individual result findings represent a value under 20% of the upper limit of normal. The above laboratory tests were performed 2 d prior to transfer to rehabilitation in December 2020 during her acute episode of COVID-19. Most indices were performed with each subsequent flare of her condition and were not found outside the normal range except as noted in the text. AI: Artificial intelligence; anti-DS: Anti-double stranded; CTD: Connective tissue disease; RNP: Ribonucleoprotein; SSA and SSB: Sjogren syndrome antigens A and B; SLE: Systemic lupus erythematosus.